List playlists on Q-Sys using Lua

list-playlists.lua

-- First we find all the files in the "playlist" directory
PlaylistFiles = dir.get('media/Playlists/')

-- Next we make a table that's going to contain all our playlist names
PlaylistNames = {}

-- Next we go through the list of playlist files we've found
for _,f in ipairs(PlaylistFiles) do

  -- Open the file
  local playlistFilename = f.name
  local file = io.open('media/Playlists/' .. f.name)
  
  -- [[ Search through the file for a new playlist name ]]
  
  -- Declare a function our for loop can call repeatedly to get new lines
  local read = function() return file:read('*line'); end
  
  -- Go through the lines in the file
  for line in read do
  
    -- Try and find a playlist name declaration in the line
    local name = line:match('^#QPL NAME ([^\r\n]*)')
    
    -- If we found one, add it to our list, 
    -- and skip reading the rest of the lines
    if(name) then
      table.insert(PlaylistNames, name)
      break
    end
    
  end
  
  -- Close the file
  file:close()
  
end

-- Assign these names as choices on the drop-down box
Controls.Playlists.Choices = PlaylistNames